PR debug/45997
	* dwarf2out.c (modified_type_die): If both is_const_type and
	is_volatile_type is set, start with DW_TAG_const_type or
	DW_TAG_volatile_type depending on where we get qualified type
	in the recursive call.

	* g++.dg/debug/dwarf2/pr45997-1.C: New test.
	* g++.dg/debug/dwarf2/pr45997-2.C: New test.

From-SVN: r167517